Veritas-bu

[Veritas-bu] block size for restore

2009-02-18 14:45:24
Subject: [Veritas-bu] block size for restore
From: Jon Bousselot <jon-bousselot AT pacbell DOT net>
To: veritas-bu AT mailman.eng.auburn DOT edu
Date: Wed, 18 Feb 2009 11:26:40 -0800
This one has me stumped.
Windows 2003 with all the latest patches.
Media written since 2003 shows up in the bpimagelist -L as having a 
media block size of 65536.

Upgrade to 6.5.3
SIZE_DATA_BUFFERS must now be 32768 because if it is anything else, I 
get media write errors.

When I try and restore data, the bptm logs show this


2/17/2009 1:46:05 PM - Error bptm(pid=1996) tapemark or blank tape 
encountered reading media header, drive index 1  
2/17/2009 1:46:06 PM - Error bptm(pid=1996) The tape device at index 1 
has a maximum block size of 32768 bytes, a buffer size of 65536 cannot 
be used
2/17/2009 1:46:06 PM - Error bptm(pid=512) The following files/folders 
were not restored:       


I cannot read the old LTO-1 tapes.  They were stored at Iron Mountain 
safely, and I tried more than three tapes from various years.
I verified the hotfix numbers for tape.sys and even tried updated tape 
drive drivers with no success.

NB docs (perf tuning guide) say the SIZE_DATA_BUFFERS is not even used 
during a restore operation.
Is there a registry key that is forcing the drive to only accept 32k 
blocks? 
The LTO-4 drive is working just fine even at the 32k block size.

-Jon Bousselot
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